A subnetwork, or subnet, is a logically visible, distinctly addressed part of a single Internet Protocol network. The process of subnetting is the division of a computer network into groups of computers that have a common, designated IP address routing prefix.
| / | binary | hex | decimal |
| /1 | 10000000.00000000.00000000.00000000 | 0x80000000 | 128.0.0.0 |
| /2 | 11000000.00000000.00000000.00000000 | 0xc0000000 | 192.0.0.0 |
| /3 | 11100000.00000000.00000000.00000000 | 0xe0000000 | 224.0.0.0 |
| /4 | 11110000.00000000.00000000.00000000 | 0xf0000000 | 240.0.0.0 |
| /5 | 11111000.00000000.00000000.00000000 | 0xf8000000 | 248.0.0.0 |
| /6 | 11111100.00000000.00000000.00000000 | 0xfc000000 | 252.0.0.0 |
| /7 | 11111110.00000000.00000000.00000000 | 0xfe000000 | 254.0.0.0 |
| /8 | 11111111.00000000.00000000.00000000 | 0xff000000 | 255.0.0.0 |
| /9 | 11111111.10000000.00000000.00000000 | 0xff800000 | 255.128.0.0 |
| /10 | 11111111.11000000.00000000.00000000 | 0xffc00000 | 255.192.0.0 |
| /11 | 11111111.11100000.00000000.00000000 | 0xffe00000 | 255.224.0.0 |
| /12 | 11111111.11110000.00000000.00000000 | 0xfff00000 | 255.240.0.0 |
| /13 | 11111111.11111000.00000000.00000000 | 0xfff80000 | 255.248.0.0 |
| /14 | 11111111.11111100.00000000.00000000 | 0xfffc0000 | 255.252.0.0 |
| /15 | 11111111.11111110.00000000.00000000 | 0xfffe0000 | 255.254.0.0 |
| /16 | 11111111.11111111.00000000.00000000 | 0xffff0000 | 255.255.0.0 |
| /17 | 11111111.11111111.10000000.00000000 | 0xffff8000 | 255.255.128.0 |